feat(deploy): add webhook receiver and launchd service for push-to-deploy

- cmd/webhook/main.go: HMAC-validated webhook receiver on :9797
- launchd plist: keeps webhook running, PATH includes docker
- Makefile: 'make webhook' target
- Registered as Gitea webhook id 15 on dtoro/oikos

Fixes: auto-deploy was not wired on mac-mini after the consolidation

Makefile

@@ -1,4 +1,4 @@
-.PHONY: build test test-db lint generate generate-check dev migrate seed export clean tidy
+.PHONY: build webhook test test-db lint generate generate-check dev migrate seed export clean tidy
 
 BINARY := oikos
 GO ?= go
@@ -6,6 +6,9 @@ GO ?= go
 build:
 	$(GO) build -o $(BINARY) -tags timetzdata ./cmd/oikos
 
+webhook:
+	$(GO) build -o webhook -tags timetzdata ./cmd/webhook
+
 test:
 	$(GO) test -race -cover ./...
 

cmd/webhook/main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/exec"
+	"time"
+
+	"github.com/dtoro/oikos/internal/safego"
+)
+
+func main() {
+	port := os.Getenv("WEBHOOK_LISTEN")
+	if port == "" {
+		port = ":9797"
+	}
+
+	secret := os.Getenv("WEBHOOK_HMAC_SECRET")
+	if secret == "" {
+		fmt.Fprintln(os.Stderr, "WEBHOOK_HMAC_SECRET must be set")
+		os.Exit(1)
+	}
+
+	repoDir := os.Getenv("WEBHOOK_REPO_DIR")
+	if repoDir == "" {
+		repoDir = os.Getenv("HOME") + "/Projects/oikos"
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/deploy", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "method not allowed", 405)
+			return
+		}
+
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, "read body failed", 400)
+			return
+		}
+
+		sigHex := r.Header.Get("X-Hub-Signature-256")
+		if sigHex == "" {
+			http.Error(w, "missing signature", 401)
+			return
+		}
+
+		mac := hmac.New(sha256.New, []byte(secret))
+		mac.Write(body)
+		expected := "sha256=" + hex.EncodeToString(mac.Sum(nil))
+
+		if !hmac.Equal([]byte(sigHex), []byte(expected)) {
+			slog.Warn("webhook: invalid signature")
+			http.Error(w, "invalid signature", 401)
+			return
+		}
+
+		slog.Info("webhook: deploy triggered")
+		w.WriteHeader(http.StatusAccepted)
+		w.Write([]byte(`{"status":"deploy started"}`))
+
+		safego.Go("webhook:deploy", func() {
+			cmd := exec.Command(repoDir + "/scripts/deploy.sh")
+			cmd.Dir = repoDir
+			cmd.Env = append(os.Environ(),
+				"REPO_DIR="+repoDir,
+				"PROFILE=full",
+			)
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			start := time.Now()
+			if err := cmd.Run(); err != nil {
+				slog.Error("webhook: deploy failed", "error", err, "duration", time.Since(start))
+				return
+			}
+			slog.Info("webhook: deploy succeeded", "duration", time.Since(start))
+		})
+	})
+
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(200)
+		w.Write([]byte("ok"))
+	})
+
+	slog.Info("webhook: listening", "port", port)
+	if err := http.ListenAndServe(port, mux); err != nil {
+		slog.Error("webhook: serve failed", "error", err)
+		os.Exit(1)
+	}
+}

scripts/deploy/network.hubris.oikos-deploy-webhook.plist

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>network.hubris.oikos-deploy-webhook</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>/Users/dtoro/Projects/oikos/webhook</string>
+    </array>
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>WEBHOOK_HMAC_SECRET</key>
+        <string>6502524162d6dbc3f6d137000395d401f1837d74ef9bb0a876f8e6bbd65d1ff2</string>
+        <key>WEBHOOK_REPO_DIR</key>
+        <string>/Users/dtoro/Projects/oikos</string>
+        <key>WEBHOOK_LISTEN</key>
+        <string>:9797</string>
+        <key>HOME</key>
+        <string>/Users/dtoro</string>
+        <key>PATH</key>
+        <string>/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
+    </dict>
+    <key>WorkingDirectory</key>
+    <string>/Users/dtoro/Projects/oikos</string>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>KeepAlive</key>
+    <true/>
+    <key>StandardOutPath</key>
+    <string>/Users/dtoro/Library/Logs/oikos-webhook.log</string>
+    <key>StandardErrorPath</key>
+    <string>/Users/dtoro/Library/Logs/oikos-webhook.log</string>
+</dict>
+</plist>